2 WHAT IS ECOLOGY?Ecology- the scientific study of interactions between organisms and their environments, focusing on energy transferEcology is a science of relationshipsWhat do you think about when I say ecology? Recycling? Acid rain?
3 WHAT DO YOU MEAN BY ENVIRONMENT? The environment is made up of two factors:Biotic factors- all living organisms inhabiting the EarthAbiotic factors- nonliving parts of the environment (i.e. temperature, soil, light, moisture, air currents)When I say environment you think what—weather. Well Ok but it it much more than that
4 Biosphere Ecosystem Community Population Organism Just like with classification, ecology is hierarchal. Each level builds on itself and they fit together like nesting boxes.PopulationOrganism
5 The lowest level of organization Organism - any unicellular or multicellular form exhibiting all of the characteristics of life, an individual.The lowest level of organizationThe lowest level is the individual. The organism. Here we see a salmon and a bear as examples of organisms. REMINDER: organisms die, species go extinct
6 POPULATIONa group of organisms of one species living in the same place at the same time that interbreedProduce fertile offspringCompete with each other for resources (food, mates, shelter, etc.)The next level is a population. A population consists of a single species living together and breeding. Give me an example of a population. Ex. large mouth bass living in Lake Meade. Beetles living under the same log. Here we have salmon spwning and two bears fishing.
7 Community - several interacting populations that inhabit a common environment and are interdependent.Next level is a community which is several populations living together and depending on each other. What does interdependent mean? An example of a community is shown here with the bear and the salmon. They both live in a common environment and the bear needs the fish for food? How does the salmon need the bear?
8 Ecosystem - populations in a community and the abiotic factors with which they interact (ex. marine, terrestrial)
9 The highest level of organization Biosphere - life supporting portions of Earth composed of air, land, fresh water, and salt water.The highest level of organizationLets review. Organisms make up populations, populations make up communities, communities and abiotic factors make up ecosystems, and all of the ecosystems make up the biosphere. From one to many and each depending on the other.
10 Habitat vs. NicheNiche - the role a species plays in a community; its total way of lifeHabitat- the place in which an organism lives out its lifeAlthough several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
11 Habitat vs. NicheA niche is determined by the tolerance limitations of an organism, or a limiting factor.Limiting factor- any biotic or abiotic factor that restricts the existence of organisms in a specific environment.Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
12 Habitat vs. Niche Examples of limiting factors - Amount of water Amount of foodTemperatureAmount of spaceAvailability of matesAlthough several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
13 Feeding Relationships There are 3 main types of feeding relationships1. Producer - Consumer2. Predator - Prey3. Parasite - HostHow do they trap the sun’s energy? Through what process? What is that process similar to in animal cells?
14 Feeding Relationships Producer- all autotrophs (plants), they trap energy from the sunBottom of the food chainHow do they trap the sun’s energy? Through what process? What is that process similar to in animal cells?
15 Feeding Relationships Consumer- all heterotrophs: they ingest food containing the sun’s energyHerbivoresCarnivoresOmnivoresDecomposersEnergy moves up the food chain through the producer/consumer relationship.
16 Feeding Relationships CONSUMERSPrimary consumersEat plantsHerbivoresSecondary, tertiary … consumersPrey animalsCarnivoresHerbivores are the 1st step up the food chain, they eat the producers
17 Feeding Relationships Consumer-Carnivores-eat meatPredatorsHunt preyanimals for food.Scavengers are a type of carnivore that eat dead animals, or carrion. Vultures, hyenas, crabs, deep sea fish-talk about distance from the sun and must eat the dead things that sink to the bottom, bottom feeders
18 Feeding Relationships Consumer- Carnivores- eat meatScavengersFeed on carrion,dead animalsScavengers are a type of carnivore that eat dead animals, or carrion. Vultures, hyenas, crabs, deep sea fish-talk about distance from the sun and must eat the dead things that sink to the bottom, bottom feeders
19 Feeding Relationships Consumer- Omnivores -eat both plantsand animalsHumans and bears are omnivores but a large and important subset of omnivores are the decomposers. They breakdown dead producers and release the energy back into circulation.
20 Feeding Relationships Consumer- DecomposersBreakdown the complex compounds of dead and decaying plants and animals into simpler molecules that can be absorbedHumans and bears are omnivores but a large and important subset of omnivores are the decomposers. They breakdown dead producers and release the energy back into circulation.
21 Symbiotic Relationships Symbiosis- two species living together3 Types of symbiosis:1. Commensalism2. Parasitism3. MutualismCleaning shrimp
22 Symbiotic Relationships Commensalism-one species benefits and the other is neither harmed nor helpedEx. orchids on a treeEpiphytes: A plant, such as a tropical orchid or a bromeliad, that grows on another plant upon which it depends for mechanical support but not for nutrients. Also called xerophyte, air plant.
23 Symbiotic Relationships Commensalism-one species benefits and the other is neither harmed nor helpedEx. polar bears and cyanobacteriaYou can see here that this polar bear is no longer white.
24 Symbiotic Relationships Parasitism-one species benefits (parasite) and the other is harmed (host)Parasite-Host relationship
26 Symbiotic Relationships Mutualism-beneficial to both speciesEx. cleaning birds and cleaner shrimpThe Egyptian plover takes insects from the backs of buffaloes, giraffes and rhinos. The plover has also been observed taking leeches from the open mouths of crocodiles! In this association the plover receives a supply of food and the other animal rids itself of unwelcome pests
27 Symbiotic Relationships Mutualism-beneficial to both speciesEx. lichenThe Egyptian plover takes insects from the backs of buffaloes, giraffes and rhinos. The plover has also been observed taking leeches from the open mouths of crocodiles! In this association the plover receives a supply of food and the other animal rids itself of unwelcome pests
29 = 1 species Type of relationship Species harmed Species benefits Species neutralCommensalismParasitismMutualism= 1 species
30 Trophic LevelsEach link in a food chain is known as a trophic level.Trophic levels represent a feeding step in the transfer of energy and matter in an ecosystem.
31 Trophic LevelsBiomass- the amount of organic matter comprising a group of organisms in a habitat.As you move up a food chain, both available energy and biomass decrease.Energy is transferred upwards but is diminished with each transfer.
32 E N R G Y Trophic Levels Producers- Autotrophs Tertiary consumers- top carnivoresSecondary consumers-small carnivoresPrimary consumers- HerbivoresProducers- Autotrophs
43 Cycling maintains homeostasis (balance) in the environment. Nutrient CyclesCycling maintains homeostasis (balance) in the environment.3 cycles to investigate:1. Water cycle2. Carbon cycle3. Nitrogen cycle
44 Evaporation, transpiration, condensation, precipitation Water cycle-Evaporation, transpiration, condensation, precipitation
48 Nitrogen cycle-Atmospheric nitrogen (N2) makes up nearly 78%-80% of air.Organisms can not use it in that form.Lightning and bacteria convert nitrogen into usable forms.
49 Nitrogen cycle-Only in certain bacteria and industrial technologies can fix nitrogen.Nitrogen fixation-convert atmospheric nitrogen (N2) into ammonium (NH4+) which can be used to make organic compounds like amino acids.N2 NH4+
50 Nitrogen-fixing bacteria: Nitrogen cycle-Nitrogen-fixing bacteria:Some live in a symbiotic relationship with plants of the legume family (e.g., soybeans, clover, peanuts).
51 Nitrogen cycle-Some nitrogen-fixing bacteria live free in the soil.Nitrogen-fixing cyanobacteria are essential to maintaining the fertility of semi-aquatic environments like rice paddies.
53 Nitrogen Cycle Atmospheric nitrogen Lightning Denitrification by bacteriaAnimalsNitrogen fixing bacteriaPlantsDecomposersNitrification by bacteriaNitritesNitratesAmmonium
54 This is called biological magnification Toxins in food chains-While energy decreases as it moves up the food chain, toxins increase in potency.This is called biological magnificationEx: DDT & Bald Eagles